Fixed-color cementitious compound and process of producing the same.



5. COMPOSlTlONS,

COATING OR PLASTIC.

UNITED STATES PATENT OFFICE.

AARON C. HORN, OF NEW YORK, N. Y.

FIXED-COLOR CEMEN'IITIOUS COMPOUND AND PROCESS OF PRODUCING THE SAME.

No Drawing.

To all whom it may concern:

Be it known that I, AARON C. I'IORN, a citizen of the United States,residing at New York city, in the borough of Manhattan, county and Stateof New York, have invented certain new and useful Improvements inFixed-Color Cementitious Compounds and Processes of Producing the Same,of which the following is a clear, full, and exact description.

The object of this invention is to provide a coloring matter for mortarcement conto nor may e rea 1y Weed, and when used, will become fixedagainst washout, running, staining, streaking and fading, by the actionof the elements.

My invention further consists in an improved process for producing suchcoloring matter.

In carrying out this invention, I provide a pigment having the desiredcolor or approximately the desired color as a base. The pig ment used byme is preferably an oxid or silicate or a mixture of the two of iron orother suitable metals. I prefer to use a natural iron ore.

y t re use 0 the ordinary iron ore or vel l -her Iam enabled to getvarying shades of red am yellow, or a combination of colors by theaddition of suitable mineral pigments, for example, by adding black andyellow, certain shades of green may be obtained. To this base I add inproper proportions a fatty acid. This may be stearic, )almitic or olcicacid or others, stearic acid, boiling said stearic acid with causticsoda dissolved in a suitable quantity 0 water. prefer to add four partsof cans: tic soda to twenty parts of the fatty ac1 40 use 1e proportionsgiven I have louin to give advantageous results when stearic acid isused. When boiled, the acid and caustic soda unite chemically, and formsodium stearate with an excess of free caus- 5 1c SOt a. o t llS I addeighty parts of the pigment base. This mixture of stearate of soda, freecaustic soda and iron pigment is preferably boiled and intimately mixed,and a stcarate of iron produced. The water is then preleralilyevaporated, and as a result I secure a colored stearate of iron inapproximately the color desired. This of itself has a poor value as acoloring medium, as it will not properly distribute the color throughthe mortar, cement or the like, in which it is to be Specification ofLetters Patent.

Application filed November 6, 1908.

used. In order to effect a. color mixture Serial No. 461,312.

t which will have all the fast and fixed characteristics desired, andyet color the mortar or the like evenly, I find it is necessary topursue the following step: To one part of the stcarate of iron of thedesired color heretofore described, I add preferably four parts of theuntreated pigment of the same.- shwl@ or color as was used to producethe stcaratc of iron, and I intimately mix the stcarate of iron and theadded pigment, grinding the same in water in a suitable mill. Theresultant mixture will be found to be capable of use either as a powderor as a paste, or in the semi-liquid form in which it comes from themill, and it may be added directly to the mortar, cement. and the like,and mixed with the same. The mixture has a specific gravity greater thanwater. \Yhcn mixed, it will be evenly distributed through the mass, andgive to the same a uniform color. Then the mortar, cement or the likehas set, it will be found that the color has set in the cement or mortarand that the color will not become affected by the elements thereafter.

\Yhile I have given certain proportions which I find to give goodresults in actual practice, I do not limit myself to such proportions,as the same may be varied considerably without affecting the resultdesired to be attained.

I am well aware that it has heretofore been proposed in waterproofingcementitious compounds by the use of a lime soap such as described inthe Newbcrry patent 851,247, April 23rd, 1907, and that a water-tightcement is described in the British patent to Liebold, 4606, 1904, and itis not my purpose to claim such waterproofing of cement. As described inthis specification, and as claimed in the claims, my invention isspecific to the cementitious compound, in which the coloring matter isadded to a stearate of iron. It is true that a stearate of iron willsecure the waterproofing effects of a lime soap, but a lime soap or apotash soap such as described in the prior patents above referred to,require a greater quantity of pigment than is required in my invention,because of the use by me of the stearatc of iron. Not only is itobviously beneficial to use less coloring matter, 2'. e. iron pigment,on account of the cost of the same, but the strength both compressiveand tensile, of the mortar or cement which has been colored by mycompound, made according to my process, is greater than that which wouldbe pro Patented Aug. 21, 1 909.

additional amount of iron pig- 1 2. The herein described cementitiouscomi pound having a fixed color, consisting of a cementitiousingredient, a colored stcarate of I with four parts of caustic soda,adding thereto eighty parts of iron pigment to produce a stearate 01iron, adding to one part of the iron, and an additional amount of ironpigment, said stearate of iron and said iron pigment hemg otapproximately the same color.

3. The herein described eementitious comand then mixing in properproportions with pound having a fixed color, consisting of acementitious ingredient, a colored stearate of E adding thereto an ironpigment to produce iron salt of the fatty acid, adding thereto ironpigment, and then mixing in proper proportions with cementitiousmaterial.

6. The herein described process of producing a fixed-color cement or thelike, consisting of mixing stearic acid with a caustic alkali to producea stearat-e oi' the alkali used, adding thereto iron pigment to producea stearate of iron, adding thereto an additional quantity of ironpigment, and then mixing in proportions with cemeut-it-ious material.

7. The herein described process of producing a fixed-color cement or thelike, consisting of mixing twenty parts oi stearic acid stearate of ironfour parts of iron pigment,

cementitious mat erial.

8. The herein described process oi produc- 1 ing a fixed-color cement orthe like, consistof boiling caustic soda and stearic acid to j produce astearate of soda with free caustic ing lixed-color cement or the like,consisting f of mixing fatty acid and a caustic alkali to Q 7 ol' ironadditional parts of the iron pigment, f and then mixing in proportionswith cementian iron salt of the fatty acid used, adding 1 theretoadditional iron pigment, and then i November 1908.

produce a fatty acid salt of the alkali used, adding thereto an ironpigment to produce mixing in proper proportions with cementltiousmaterial.

5. The herein described process of producmg a fixed-color cement or thelike, consistl l l ing ol mixing caustic soda and a fatty acid to Isoda, adding thereto aniron pigment to produce a stearate of iron,adding to the stearate tious material.

Signed at New York city this 4th day of AA RON C. HORN.

\Yitnesscs:

J. BAXTER, A. A. GARRIGAN.

